Spray gun



FIG. 1 is a front side elevational view of a spray gun showing my new design, with the back side being a mirror image thereof;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a spray gun, as shown and described. 